Abstract Details
| Name: K Sasikumar Raja Affiliation: IISER, Pune Conference ID: ASI2018_458 Title : Turbulent density fluctuations and proton heating rate in the solar wind from $9-20~R_{\odot}$ Authors and Co-Authors : K. Sasikumar Raja, Indian Institute of Science Education and Research, Pashan, Pune - 411 008, India. Prasad Subramanian, Indian Institute of Science Education and Research, Pashan, Pune - 411 008, India. R. Ramesh, Indian Institute of Astrophysics, 2nd Block, Koramangala, Bangalore - 560 034, India. Angelos Vourlidas, Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA. Madhusudan Ingale, Plot No. 2, Near RSS office, Bamb Colony, Jammer Road, Bhusaval - 425 201, India. Abstract Type : Contributed Talk Abstract Category : Sun and the Solar System Abstract : We obtain scatter-broadened images of the Crab Nebula at 80 MHz as it transits through the inner solar wind in June 2016 and 2017. These images are anisotropic, with the major axis oriented perpendicular to the radially outward coronal magnetic field. Using these data, we deduce that the density modulation index ($\delta N_e/N_e$) caused by turbulent density fluctuations in the solar wind ranges from 1.9 $\times 10^{-3}$ to 7.7 $\times 10^{-3}$ between 9 —- 20 $R_{\odot}$. We also find that the heating rate of solar wind protons at these distances ranges from $2.2 \times 10^{-13}$ to $1.0 \times 10^{-11} ~\rm erg~cm^{-3}~s^{-1}$. On two occasions, the line of sight intercepted a coronal streamer. We find that the presence of the streamer approximately doubles the thickness of the scattering screen. |